This is a close-up of the leaves in the painting below. Before painting the leaves it was necessary to place an under-painting of interesting colors. This under painting shows up in the veins after they were painted in a negative fashion. I love painting white roses..... They may look white, but the petals are actually almost 75% tinted with blues, purples, and rose pink. It is difficulty to see in a picture, but the yellow is a Daniel Smith pigment called Iridescent gold . This color actually sparkles. 
